Off-line cleaning system for reverse osmosis membrane

Abstract

The utility model relates to an off-line cleaning system for a reverse osmosis membrane. The off-line cleaning system comprises a chemical cleaning water tank, a security filter, a reverse osmosis membrane shell and a control system, a reverse osmosis membrane is mounted in the reverse osmosis membrane shell; chemical cleaning liquid is arranged in the chemical cleaning water tank; a heater is arranged at the bottom of the chemical cleaning water tank; the chemical cleaning water tank is connected with an underground collecting pool. The reverse osmosis membrane cleaning device disclosed by the utility model has the beneficial effects that the reverse osmosis membrane in each reverse osmosis membrane shell can be thoroughly cleaned, so that the cleaned reverse osmosis membrane has good reverse osmosis performance; the temperature of the chemical cleaning liquid is automatically regulated and controlled in real time; the pressure value of the chemical cleaning liquid flowing through the interior of the liquid inlet pipeline is observed through the pressure gauge, so that whether the power of the multi-stage centrifugal pump needs to be adjusted or not is judged to ensure the high cleaning efficiency of the reverse osmosis membrane; the flux for cleaning the reverse osmosis membrane is observed through the rotor flow meter, so that the thorough alkali washing or acid washing of the reverse osmosis membrane is ensured; the waste chemical cleaning liquid is prevented from being deposited in the chemical cleaning water tank.

Description

Technical Field

[0001] This utility model relates to the field of reverse osmosis membrane cleaning, and in particular includes an offline cleaning system for reverse osmosis membranes. Background Technology

[0002] Offline cleaning of reverse osmosis membranes involves preparing a chemical cleaning solution and using a specialized cleaning device to immerse, circulate, and mechanically flush the membrane elements to restore their operational capacity. Severely fouled reverse osmosis membranes are well-suited for offline cleaning. Removing fouling substances from the reverse osmosis membrane surface using chemical cleaning solutions is an effective measure to restore the normal operating capacity of the membrane unit and extend the service life of the membrane elements.

[0003] During the cleaning process, the effectiveness of the cleaning solution gradually decreases as the cleaning progresses. At the same time, contaminants removed from the upstream reverse osmosis membrane modules become mixed in the cleaning solution, causing fouling of the downstream reverse osmosis membrane modules and reducing the flow rate. Traditional offline reverse osmosis membrane cleaning systems cannot ensure that each reverse osmosis membrane is thoroughly cleaned, resulting in low cleaning efficiency and an inability to accurately determine whether the cleaning is thorough.

[0004] Therefore, there is an urgent need for an offline cleaning system for reverse osmosis membranes that can ensure each reverse osmosis membrane is thoroughly cleaned, has high cleaning efficiency, and can accurately determine whether the cleaning is thorough. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an offline cleaning system for reverse osmosis membranes.

[0006] This offline cleaning system for reverse osmosis membranes includes a chemical cleaning tank, a security filter, a reverse osmosis membrane housing, and a control system. The reverse osmosis membrane housing contains a reverse osmosis membrane. The chemical cleaning tank contains chemical cleaning solution and has a heater at its bottom. The chemical cleaning tank is connected to an underground collection tank. The inlet of the chemical cleaning tank is connected to the security filter, and the outlet of the security filter is connected to a multi-stage centrifugal pump. The outlet of the multi-stage centrifugal pump has a temperature sensor, the other end of which is connected to a pressure gauge. The other end of the pressure gauge is connected to the inlet of the reverse osmosis membrane housing. The outlet of the reverse osmosis membrane housing is connected to a rotor flow meter, the other end of which is connected to the chemical cleaning tank. An inlet pipe connects the chemical cleaning tank and the inlet of the reverse osmosis membrane housing, and an outlet pipe connects the outlet of the reverse osmosis membrane housing and the chemical cleaning tank. A branch pipe connects the temperature sensor and the pressure gauge, including an inlet pipe and a return pipe. The inlet pipe connects to the pressure gauge, and the return pipe connects to the security filter. The temperature sensor and the control system are connected, and the control system controls the heater.

[0007] Preferably, the inlet pipe connecting the chemical cleaning water tank and the security filter is equipped with a manual regulating valve; the return pipe is equipped with a manual regulating valve; the multi-stage centrifugal pump and the temperature sensor are equipped with a manual regulating valve; and the outlet end of the reverse osmosis membrane housing and the rotor flow meter are equipped with a manual regulating valve.

[0008] Preferably, the inlet end of the reverse osmosis membrane housing is a side inlet end, and the side inlet end is connected to an inlet pipe; the outlet end of the reverse osmosis membrane housing includes a end outlet end and a side outlet end; both the end outlet end and the side outlet end are connected to outlet pipes; the outlet pipes are equipped with a rotor flow meter.

[0009] Preferably, a manual regulating valve is provided in the outlet pipe between the side outlet end of the reverse osmosis membrane housing and the rotor flow meter.

[0010] Preferably, a liquid inlet pipe is connected in series between the liquid inlet ends of several reverse osmosis membrane housings, and a liquid outlet pipe is connected in series between the liquid outlet end and the liquid outlet side of several reverse osmosis membrane housings.

[0011] Preferably, the chemical cleaning water tank includes chemical cleaning waste liquid and chemical cleaning liquid, which are isolated from each other; a manual regulating valve is provided between the underground collection tank and the chemical cleaning water tank.

[0012] Preferably, the reverse osmosis membrane housing is a two-piece membrane housing, with one reverse osmosis membrane installed in each membrane housing.

[0013] Preferably, the chemical cleaning solution is demineralized water.

[0014] The beneficial effects of this utility model are:

[0015] 1) This practical cleaning system can clean the reverse osmosis membranes in multiple reverse osmosis membrane housings at the same time, and can also clean the reverse osmosis membranes in a single reverse osmosis membrane housing individually. It can accurately control the flow rate, flow rate, and inlet water pressure of the chemical cleaning process, thereby ensuring that the reverse osmosis membranes in each reverse osmosis membrane housing can be thoroughly cleaned. The cleaning effect is good and the cleaning efficiency is high, so that the cleaned reverse osmosis membranes have good reverse osmosis performance.

[0016] 2) The chemical cleaning water tank of this utility model controls the temperature through a heater. A temperature sensor is installed on the outlet pipe of the centrifugal pump. The temperature sensor is connected to the control system. When the ambient temperature is low, especially in winter, the heater can be introduced into the chemical cleaning water tank to heat the chemical cleaning solution. The temperature sensor is linked with the heater to realize real-time automatic control of the temperature of the chemical cleaning solution, thereby ensuring the cleaning efficiency and effect of the reverse osmosis membrane in the reverse osmosis membrane housing.

[0017] 3) A pressure gauge is installed between the reverse osmosis membrane housing and the security filter in this utility model. The pressure gauge is connected to the control system signal. The pressure value of the chemical cleaning solution flowing through the inlet pipe can be observed through the pressure gauge, thereby determining whether the power of the multi-stage centrifugal pump needs to be adjusted to ensure the high efficiency of cleaning the reverse osmosis membrane.

[0018] 4) The chemical cleaning solution outlet of the reverse osmosis membrane housing in this utility model is equipped with a rotor flow meter. The flow rate of the reverse osmosis membrane is observed by the rotor flow meter to determine whether the alkaline or acid washing time needs to be extended, so as to ensure the thoroughness of the alkaline or acid washing of the reverse osmosis membrane.

[0019] 5) This practical chemical cleaning tank contains chemical cleaning solution and waste chemical cleaning solution that flows out after cleaning. The waste chemical cleaning solution and the chemical cleaning solution are isolated from each other. The chemical cleaning tank is connected to an underground collection tank, which collects, treats and neutralizes the waste chemical cleaning solution. A manual regulating valve is installed between the underground collection tank and the chemical cleaning tank, which can quickly discharge the waste chemical cleaning solution in the chemical cleaning tank to the underground collection tank, avoiding the mixing of pollutants in the waste chemical cleaning solution with the chemical cleaning solution. At the same time, it can control the outflow rate of the waste chemical cleaning solution to prevent the waste chemical cleaning solution from accumulating in the chemical cleaning tank. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the principle of an offline cleaning system for reverse osmosis membranes.

[0021] Explanation of reference numerals in the attached diagram: 1. Chemical cleaning water tank; 2. Heater; 3. Manual regulating valve; 4. Security filter; 5. Multistage centrifugal pump; 6. Temperature sensor; 7. Pressure gauge; 8. Reverse osmosis membrane housing; 9. Rotor flow meter; 10. Inlet pipe; 11. Return pipe; 12. Outlet pipe. Detailed Implementation

[0022] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0023] As one embodiment, an offline cleaning system for reverse osmosis membranes is proposed, such as... Figure 1As shown, the system includes a chemical cleaning water tank 1, a security filter 4, a reverse osmosis membrane housing 8, and a control system. A reverse osmosis membrane is installed inside the reverse osmosis membrane housing 8. The chemical cleaning water tank 1 contains chemical cleaning solution, and a heater 2 is located at the bottom of the chemical cleaning water tank 1. The chemical cleaning water tank 1 is connected to an underground collection tank. The inlet of the chemical cleaning water tank 1 is connected to the inlet of the security filter 4, and the outlet of the security filter 4 is connected to a multi-stage centrifugal pump 5. A temperature sensor 6 is located at the outlet of the multi-stage centrifugal pump 5, and the other end of the temperature sensor 6 is connected to a pressure gauge 7. The other end of the pressure gauge 7 is connected to the inlet of the reverse osmosis membrane housing 8, and the outlet of the reverse osmosis membrane housing 8 is connected to a rotor flow meter 9. The other end of the rotor flow meter 9 is connected to the chemical cleaning water tank 1. An inlet pipe 10 connects the chemical cleaning water tank 1 and the inlet of the reverse osmosis membrane housing 8, and the outlet of the reverse osmosis membrane housing 8 is connected to the chemical cleaning water tank 1. A liquid outlet pipe 12 is connected between the chemical cleaning water tank 1 and the liquid outlet pipe 12; a branch pipe is provided between the temperature sensor 6 and the pressure gauge 7, the branch pipe including the liquid inlet pipe 10 and the return pipe 11; the liquid inlet pipe 10 is connected to the pressure gauge 7, and the return pipe 11 is connected to the security filter 4; the temperature sensor 6 is connected to the control system signal, and the control system controls the heater 2; the temperature of the chemical cleaning water tank 1 is controlled by the heater 2, and the temperature sensor 6 is provided on the outlet pipe of the multi-stage centrifugal pump 5. The temperature sensor 6 is connected to the control system signal. When the ambient temperature is low, especially in winter, the heater 2 can be introduced into the chemical cleaning water tank 1 to heat the chemical cleaning solution. The temperature sensor 6 is linked with the heater 2 to realize real-time automatic regulation of the temperature of the chemical cleaning solution, thereby ensuring the cleaning efficiency and cleaning effect of the reverse osmosis membrane in the reverse osmosis membrane housing.

[0024] Pressure gauge 7 is connected to the control system signal. The pressure value of the chemical cleaning solution flowing through the inlet pipe 10 can be observed through pressure gauge 7 to determine whether the power of the multi-stage centrifugal pump needs to be adjusted to ensure the cleaning efficiency of the reverse osmosis membrane. The inlet pipe 10 connecting the chemical cleaning water tank 1 and the security filter 4 is equipped with a manual regulating valve 3. The return pipe 11 is equipped with a manual regulating valve 3. A manual regulating valve 3 is installed between the multi-stage centrifugal pump 5 and the temperature sensor 6. A manual regulating valve 3 is installed between the outlet end of the reverse osmosis membrane housing 8 and the rotor flow meter 9.

[0025] The inlet end of the reverse osmosis membrane housing 8 is a side inlet end, and an inlet pipe 10 is connected to the side inlet end. The outlet end of the reverse osmosis membrane housing 8 includes a end outlet end and a side outlet end. Both the end outlet end and the side outlet end are connected to an outlet pipe 12. An osmosis flow meter 9 is installed in the outlet pipe 12. A manual regulating valve 3 is installed in the outlet pipe 12 between the side outlet end of the reverse osmosis membrane housing 8 and the osmosis flow meter 9. Inlet pipes 10 are connected in series between the inlet ends of several reverse osmosis membrane housings 8, and outlet pipes 12 are connected in series between the end outlet end and the side outlet end of several reverse osmosis membrane housings 8 respectively. An osmosis flow meter 9 is installed at the chemical cleaning liquid outlet of the reverse osmosis membrane housing 8. The flux of cleaning the reverse osmosis membrane is observed through the osmosis flow meter 9 to determine whether the alkaline washing or acid washing time needs to be extended, so as to ensure the thoroughness of alkaline washing or acid washing of the reverse osmosis membrane.

[0026] A manual regulating valve 3 is installed between the underground collection tank and the chemical cleaning water tank 1. After cleaning, the liquid outlet pipe 12 contains chemical cleaning waste liquid. The chemical cleaning waste liquid is initially collected by the chemical cleaning water tank 1 and flows into the underground collection tank. After the underground collection tank collects, treats, and neutralizes the chemical cleaning waste liquid, it is uniformly recycled to the sewage treatment system for centralized treatment. The chemical cleaning waste liquid and chemical cleaning liquid in the chemical cleaning water tank 1 are isolated from each other. When the chemical cleaning waste liquid is generated at a relatively fast rate, the manual regulating valve 3 between the underground collection tank and the chemical cleaning water tank 1 is opened to quickly discharge the chemical cleaning waste liquid in the chemical cleaning water tank 1 into the underground collection tank.

[0027] The reverse osmosis membrane housing 8 is a two-piece membrane housing, with one reverse osmosis membrane installed in each housing. The chemical cleaning solution is demineralized water.

[0028] The offline cleaning system for reverse osmosis membranes can clean multiple reverse osmosis membrane housings 8 simultaneously, or clean a single reverse osmosis membrane housing 8 individually. It can accurately control the flow rate, flow volume, and inlet water pressure during the chemical cleaning process, thereby ensuring that the reverse osmosis membrane in each reverse osmosis membrane housing 8 can be thoroughly cleaned. The cleaning effect is good and the cleaning efficiency is high, so that the cleaned reverse osmosis membrane has good reverse osmosis performance.

Claims

1. An offline cleaning system for reverse osmosis membranes, characterized in that, include: The system comprises a chemical cleaning tank, a security filter, a reverse osmosis membrane housing, and a control system. The reverse osmosis membrane housing contains a reverse osmosis membrane. The chemical cleaning tank contains chemical cleaning solution and has a heater at its bottom. The chemical cleaning tank is connected to an underground collection tank. The inlet of the chemical cleaning tank is connected to the security filter, and the outlet of the security filter is connected to a multi-stage centrifugal pump. A temperature sensor is installed at the outlet of the multi-stage centrifugal pump, with a pressure gauge connected to the other end. The pressure gauge is connected to the inlet of the reverse osmosis membrane housing, and a rotor flow meter is connected to the chemical cleaning tank. An inlet pipe connects the chemical cleaning tank and the inlet of the reverse osmosis membrane housing, and an outlet pipe connects the outlet of the reverse osmosis membrane housing and the chemical cleaning tank. A branch pipe connects the temperature sensor and the pressure gauge, including an inlet pipe and a return pipe. The inlet pipe connects to the pressure gauge, and the return pipe connects to the security filter. The temperature sensor and the control system are connected, and the control system controls the heater.

2. The offline cleaning system for reverse osmosis membranes according to claim 1, characterized in that, The inlet pipe connecting the chemical cleaning water tank and the security filter is equipped with a manual regulating valve; the return pipe is equipped with a manual regulating valve; the multi-stage centrifugal pump and the temperature sensor are equipped with a manual regulating valve; and the outlet end of the reverse osmosis membrane housing and the rotor flow meter are equipped with a manual regulating valve.

3. The offline cleaning system for reverse osmosis membranes according to claim 1, characterized in that, The inlet end of the reverse osmosis membrane housing is a side inlet end, and the side inlet end is connected to an inlet pipe; the outlet end of the reverse osmosis membrane housing includes a end outlet end and a side outlet end; both the end outlet end and the side outlet end are connected to outlet pipes; the outlet pipes are equipped with a rotor flow meter.

4. The offline cleaning system for reverse osmosis membranes according to claim 3, characterized in that, A manual regulating valve is installed in the outlet pipe between the side outlet end of the reverse osmosis membrane housing and the rotor flow meter.

5. The offline cleaning system for reverse osmosis membranes according to claim 3, characterized in that, Several reverse osmosis membrane housings are connected in series with inlet pipes at their inlet ends, and several reverse osmosis membrane housings are connected in series with outlet pipes at their end outlet and side outlet ends.

6. The offline cleaning system for reverse osmosis membranes according to claim 1, characterized in that, The chemical cleaning water tank contains chemical cleaning waste liquid and chemical cleaning liquid, which are isolated from each other; a manual regulating valve is installed between the underground collection tank and the chemical cleaning water tank.

7. The offline cleaning system for reverse osmosis membranes according to claim 1, characterized in that, The reverse osmosis membrane housing is a two-piece set, with one reverse osmosis membrane installed in each set.

8. The offline cleaning system for reverse osmosis membranes according to claim 1, characterized in that, The chemical cleaning solution is demineralized water.

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